There are estimates of over 30 million regular users in the USA. The impact could be two fold on Healthcare. First, the tax of it could go to Healthcare and many who are suffering with various cronic pain would have an alternative from taking synthetic drugs laden with harmful side effects.
I know of someone that suffers with migraine headaches that swears it is the only substance that makes the headaches go away. He buys it from one of his friends that is a CPA and not some back alley drug dealer!